Caption:WASHINGTON, DC - JUNE 18: General Keith Alexander, director of the National Security Agency, arrives for testimony before the House Select Intelligence Committee June 18, 2013 in Washington, DC. The committee heard testimony on the topic of 'how the disclosed NSA programs protect Americans from terror attacks on US soil, and why the disclosure of that classified information aids our adversaries.' (Photo by Win McNamee/Getty Images)

Caption:

WASHINGTON, DC - JUNE 18: General Keith Alexander, director of the National Security Agency, arrives for testimony before the House Select Intelligence Committee June 18, 2013 in Washington, DC. The committee heard testimony on the topic of 'how the disclosed NSA programs protect Americans from terror attacks on US soil, and why the disclosure of that classified information aids our adversaries.' (Photo by Win McNamee/Getty Images)

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